python学习笔记 - dict.update
在学习tornado template源码的时候，遇到以下dict.update语法：

 def generate(self, **kwargs):        """Generate this template with the given arguments."""        namespace = {            "escape": escape.xhtml_escape,            "url_escape": escape.url_escape,            "json_encode": escape.json_encode,            "squeeze": escape.squeeze,            "datetime": datetime,        }        namespace.update(kwargs)

对于dict object的update函数做下代码场景和学习笔记：

dic = {"A":"a", "B":"b"}# print the original dict object, output {"A":"a", "B":"b"}print dic# update the given key to invoke the another value if the given key existsdic.update(A="Aa")# output {'A': 'Aa', 'B': 'b'}print dic# if the the given key is not existed, add this key/value pair in the target dict objectdic.update(C="C")# output {'A': 'Aa', 'C': 'C', 'B': 'b'}print dic

;) ! Move on!!!!!